Remove GTalk Pepper interfaces and related code.

chrome/browser/renderer_host/pepper/pepper_talk_host.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TALK_HOST_H_
-#define CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TALK_HOST_H_
-
-#include "base/memory/weak_ptr.h"
-#include "ppapi/c/private/ppb_talk_private.h"
-#include "ppapi/host/resource_host.h"
-#include "ppapi/proxy/resource_message_params.h"
-
-namespace content {
-class BrowserPpapiHost;
-}
-
-namespace ppapi {
-namespace host {
-struct ReplyMessageContext;
-}
-}
-
-namespace chrome {
-
-class PepperTalkHost : public ppapi::host::ResourceHost {
- public:
-  PepperTalkHost(content::BrowserPpapiHost* host,
-                 PP_Instance instance,
-                 PP_Resource resource);
-  ~PepperTalkHost() override;
-
- private:
-  // ResourceHost override.
-  int32_t OnResourceMessageReceived(
-      const IPC::Message& msg,
-      ppapi::host::HostMessageContext* context) override;
-
-  int32_t OnRequestPermission(ppapi::host::HostMessageContext* context,
-                              PP_TalkPermission permission);
-  int32_t OnStartRemoting(ppapi::host::HostMessageContext* context);
-  int32_t OnStopRemoting(ppapi::host::HostMessageContext* context);
-  void OnRemotingStopEvent();
-
-  void OnRequestPermissionCompleted(ppapi::host::ReplyMessageContext reply);
-  void OnStartRemotingCompleted(ppapi::host::ReplyMessageContext reply);
-  void OnStopRemotingCompleted(ppapi::host::ReplyMessageContext reply);
-
-  content::BrowserPpapiHost* browser_ppapi_host_;
-  bool remoting_started_;
-  base::WeakPtrFactory<PepperTalkHost> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(PepperTalkHost);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TALK_HOST_H_